Trendelenburg's Test is used to determine gluteus medius weakness. The gluteus medius is one of three gluteal muscles. The other two gluteal muscles include the gluteus maximus and gluteus minimus. To perform the test, have the patient stand with their weight evenly placed on both feet. Then, have them put their hands on their hips. As the examiner, stand behind them to observe. Ask the patient to lift their leg opposite of the side being tested. If the pelvis lowers on the nonweight bearing side, the patient is showing a positive sign of gluteus medius weakness.
(This answer provided for NATA by the Gustavus Adolphus College Athletic Training Education Program.)
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